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Description
Here is a typical warning:
MBX:WARNING: unresolved <xref> due to unknown reference "remark-Minkowski"
located within: "fact-lagrange-four-square" (xml:id), "Lagrange's four square theorem" (title)
This would be more helpful if it said which file this happened in. If this is not possible due to xinclude only being part of the command but the whole xml source is in memory as one "file", maybe the warning could give a few more layers of which section/chapter it is in, at least.